INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits
Beginning balance	$ 99	$ 93	$ 119
Increase in prior period tax positions	3	3	5
Decrease in prior period tax positions	(2)	(1)	0
Increase in current period tax positions	204	4	2
Settlements with taxing authorities	0	0	(32)
Expiration of statutes of limitations	0	0	(1)
Ending balance	304	99	93
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate	(105)	(87)	(81)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate	34	31	27
San Diego Gas and Electric Company [Member]
Reconciliation of Unrecognized Tax Benefits
Beginning balance	13	12	11
Increase in prior period tax positions	1	1	1
Ending balance	14	13	12
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate	(11)	(10)	(9)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate	1	1	1
SoCalGas
Reconciliation of Unrecognized Tax Benefits
Beginning balance	68	64	61
Increase in prior period tax positions	1	1	1
Increase in current period tax positions	3	3	2
Ending balance	72	68	64
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate	(63)	(59)	(55)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate	$ 33	$ 30	$ 26